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Patent US2572425A successfully refreshed from Google Patents.
US2572425A
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Centrifugal separation of heavy boiler oil
Assignee: Alfa Laval Holdings Amsterdam AB
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Filing: 1948-08-19
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Granted: 1951-10-23
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Expires: 1968-08-19
Abstract
No abstract record available.
Inventors
- 👤 Andersson Gustav Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:42
CPC Classifications
C; C10; C10G; C10G31/00; C10G31/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1412738A
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US1749764A
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US1831500A
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US1749291A
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US2139715A
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US2261724A
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US2223999A
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US2373349A
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US2365256A
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US2467742A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |